Hibernate hql查询语法错误

Question

尝试执行此查询：

public List<Product> getChildrenById(int id) {          
        String hql= " FROM Product"
                + " START WITH parent_id = ?"
            + " CONNECT BY NOCYCLE PRIOR  id = parent_id"
            + " ORDER SIBLINGS BY id"; 
        return (List<Product>) entityManager.createQuery(hql).setParameter(1, id).getResultList();
    }

我遇到语法错误：org.hibernate.hql.internal.ast.QuerySyntaxException：意外令牌：WITH靠近第1行，第44列[FROM com.example.gmao.model.Product START WITH parent_id =？ CONNECT BY NOCYCLE PRIOR id = parent_id ORDER SIBLINGS BY id];

任何帮助？ THX